International security standards and procedures are as varied as the countries to which they apply. The tangled network of shifting rules differs by nation, route, airport, airline, or (as it sometimes seems) the fleeting mood of the screener going through your stuff. What's a traveler to do? We'll say it several times in this article: When journeying abroad, contact your airline or refer to your arrival airport's official website for specific information regarding local laws. But before you do, find out which general airport security rules you should be aware of wherever you're headed.